Clare Island Survey — Fresh-ivater Algae. 16 43 



Oscillatoria nigra Vaucli. — L ; D, 8/t broad. 

 nigro-viridis Thw. — W. 

 princeps Vauch. — C, 26 , 6-2S'3/u broad, cells 6 times shorter than broad ; 



W ; 23-25ju broad ; Cr, 27'5-30/x broad ; D, a smaller form, 20// 



broad. 

 splendida Grev.— W. 

 subtilissima Ktttz. — C. 

 tenuis Ag. — C, 9'5/t broad, 4 - 5/i long; L; Mw, a form with cells as long 



as broad ; VL ; M, 8 - 4ju broad, 3/* long. 



Sub-fam. Spirulineae. 



Spirulina subsalsa Oersted.— W; C, thickness of coil 4/x, of trichome 1'3/t, in 

 fresh water in both cases, 

 major Kiitz. — S.W. of D, breadth of spiral 4/i, breadth of filaments 16/>, 

 distance between turns 3-4//.. 



Sub-fam. Lyngbyeae. 

 Phormidium inundatum Kiitz. — VL. 

 P. subfuscum Kiitz. — W. 



tenue (Menegh.) Gom. — Ac, l'Sfi broad, 2/x long; C, mostly 1'5/t broad, 

 but sometimes up to 2'5/j.; Mw, LG, L, CI. 

 Lyngbya aestuarii (Mart.) Lieben. — C, filaments 20^ broad, cells (i-7/t long ; 

 VL, filaments 12-5-13'5 broad, cells 1'7/u long. 

 aerugineo-coerulea (Kiitz.) Gom. — L, filaments 3-6-4/t broad, cells 2-2 - 5ju 



long; VL, filaments 5 - 5-5 - 8/i broad, cells 2 , 5-3'3ju long; M. 

 *Diqueti Gom. — M, filaments 2'5-3/x broad, cells 2-2-3 long, 

 limnetica Lemm. — 1 >. 

 martensiana Menegh. — 0, filaments 11/t broad, trichornes 6o/x broad : OP. 



filaments 7'5-8 - 2 broad, cells 2-5-3ju long, rosy- violet. 

 CLIARENSIS sp. nov. — L. fills singulis libere natantibus, rectis vel sub- 

 rectis, lV5-12'0fi lat., rigidis, vaginis hyalinis et crassis, L7/u cmssi- 

 tudine, trichomatibus coernleo-aerugineis, contentu granulis sparsis, 

 6-ti"7(U lat. articulis valde inequalibus, diametro semper longioribus, 

 9-24;u long. (Plate I, fig. 7.) C. 

 *putealis Mont. — D, a form not more than S/x broad with sheath, trichornes 



~fx, cells mostly subquadrate. 

 *Rivulariarum Gmn.-SL, 0-9/, broad; L, C, VL; C O'S/u broad; LG, 



DL, Cr. 

 subtilis West.— M, 1-5-1-6/u broad, 2'2-2-5/u long; W"; 1. L6/u broad, 

 2-21/x long ; EL, 1'tJ// broad ; L. 

 P2 



